Machine for cutting screws



(No Model.) `3 Sheets-Sheet 1. H. E. COY.

MACHINE FOR CUTTING SGREWS. N0. 357,180. Patented Feb. 8, 1887.

(No Model.) 3 Sheets-Sheet 2.

H. E. ooY.

MACHINE FOR CUTTING SCREWS.

4180.857,180. .Patented Feb. 8, 1887.

N. PETERS, Phwllhugmphnn Washingtun. DV C.

3 Sheets-Sheet 3.

(No Mom.)

H'. B.- GOY. MACHINE FOR GUTTING- SGREWS.

Patented Feb. 8, 1887.

W lTNEssgs:

. single operation, a rotating steel disk having 5o tion-clutch a.

UNITED STATES PATENT OFFICE.'

HENRY n OOY, or TOLEDO, OHIO.

MACHiNE FOR CUTTING SCREWS.

SPECIFICATION forming part of Letters Patent No. 357,180, dated February8, 1887. Application llcd January 11, 188,6. Serial No. 188.207. (Nomodel.)

To @ZZ whom it may concern:

Be it known that I, HENRY E. COY, a citizen of 'the United States,residing at rIoledo, Lucas county, Ohio, have invented certain new anduseful Improvements in and relating to ScrewLCutting or Screw-ThreadingMachines, of which the following is a specification.

The object of lmy invention is to provide,.

as a'means or tool for cutting and finishing large pointed screw-boltsor lag-screws by a a toothed periphery, the teeth and notches of whichare arranged spirally to the disks axis, the corners of the severalteeth formed by the lat* as cutting-points or chasers; also, to provideinea'ns for' giving such cutter and the bolt to j l porting rollerattached Ato rotary cutter, and .A 30

represented in place on its adjustable seat; Fig. 7, an end elevation ofthe same; Fig. S, a plan of the same, Fig. 9, a side view of former orroller-guide in place on its plate; Fig. 10, an end View of the same;Fig. l1, a plan view of the same; Figs. 12 and 13, plans of rotarycutter and screws partly out; Fig. 14, an end view of traveling head andmechanism for releasing the same from feed-screw; Fig. 15, a rearelevation of same; Fig. 16, an end view of nut m, hereinafter'referredto; and Fig. 17, a side view of same.

The same letters areused to indicate like parts throughout the severalgures.

My machine is mounted upon astout frame or table. A spindle carrying thebolt to be threaded is provided with a socket to receive the head of thebolt I), andY is driven directly by cone-pulley A, which is made to runfast or loose on its shaftat will by means of fric- Bolt b is braced andprevented from yielding or bending from the pressure of angle ofthe faceand side of the disk servingthe cutter by means of guide-block b ontraveling head Rotary toothed'cutter c, which resembles a disk cuttransversely froin alarge multiple-threaded screw, rotates horizontally,the upperscorners or angles of the teeth of the cutter forming a seriesof cutting or chasing edges.

Bolt b, in Figs. 1, 2, 12, and 13, revolves from the observer, andcutter c revolves from left to right, so that the shavings are taken offtoward the point or end of bolt b.

At the beginning of the operation, bolt b to be threaded and pointedbeing in place, cutter c is set touching the bolt, and so that thecircle described by the cutting edges or corners of the teeth of cutterc touches the extended line of the a`Xis of the bolt. Bolt b beingcaused to revolve, cutter c is also rotated at such constant rate ofspeed that for each revolution of bolt b cutter c rotates the distanceofA from the face of one tooth to the corresponding face of the nexttooth, allowing also for the forward travel of cutter c. From thispoint, besides its rotary motion, which, for convenience, may be calledits first motion, cutter c has also the following motions, viz: second,

forward in the direction of the line of bolt b third, away from thecenter line of bolt b gradually, according to the taper of pointrequired; fourth, when bolt b is threaded as far as desired, stillfarther away `from the bolt; so that the cutter no longer touches thebolt,and, llfth, the return to its starting-point.

Vertical shaft d of cutter c, Figs. 4 and 5, is provided with worm-wheel@engaging screw f on square shaft g, on which is pinion 10. The first orrotary motion, at a speed relative to that of bolt b, as above stated,is communicated to cutter through train of gearing l (on shaft of`cone-pulley) 2 3 t 8 8 9 10, shaft g, screw f, and worm-wheel con shaftd.

Box h, containing shaftd and worm-gearing ef, is attached to slidinghead t', secured to and running upon shears or way k. Horizontalfeed-screw Z, extending the entire length of way @revolves in a groovein the upper face of 7c, so that only a small part of the screwl appearsabove the upper face of way k. Through a vertical opening in head t',directly over screw Z, is inserted half-nut m, which 4en- IOO gages theupper part of horizontal feed-screw y l. Screwl centers in pinion 7 andreceives motion through train of gear-wheels l, 2, 3, 4, 5, 6, G, and inthe order mentioned. Screw Z being caused to revolve, nut m, beingforced down upon the screw, travels along said screw, carrying with itsliding head t and box h, attached thereto, together with cutter c,shaft (l, worin-wheel c, and screwj', the latter sliding upon squareshaft g. The rapidity of the horizontal travel or feed of rotary cutterc may be governed by theY lead of screw l and nut my. The screw I, as ameans of securing the feed of cutter c horizontally as the cutprogresses, is not, nor is the worm-gearing d e f g, as a means ofsecuring rotation of the cutter, absolutely essential, for withoutthese, when the cutting-corners of c catch the iron of bolt b properly,a slight spiral cut is at once formed on bolt b, which, growing`constantly deeper by engaging successively the spiral teeth of cutter c,causes said cutter to both rotate on its axis (after the manner ofwormgearing) and to feed forward, and thus to perform its office; but Iprefer the herein-de scribed positive means of securing rotation andfeed of cutter as more certain, expeditious, and uniform in results.

For the purpose of securing its third and fourth motions abovementioned, rotating eutter c is designed and arranged to tilt to andfrom bolt b in such a manner thatthe cutting-edges describe an are of acircle of which square shaft g is the center. On shaft g, at each end ofscrewj", fitting loosely ou said shaft, so as to slide, (see Fig. 5,)are collars n, having cy.- lindrical exteriors. Over collars u areslipped sleeves a', which are screwed into box 71 as shown in Fig. 5.Plate o, having at each end sockets p, (see Figs. 14 and 15,) is boltedto head t'. Sleeves n are slipped into sockets p, fitting looselytherein. Socketsp are prevented from rotating by their connecting-plateo being bolted to head t, and collar u is prevented from rotating bysquare shaft g; but sleeves n', with their attached box h and itsappendages,) fitting loosely between collar a and sockets j), arepermitted to rotate vertically on shaft g as a center.

Attached to box 7L is curved arm q, bearing at its outer end roller r,arranged to travel in the direction of motion of sliding head t. Bydepressing or elevating roller 1' cutter c is thrown from or toward boltb, as the case may be, thus providing for giving taper to the bolt beingthreaded, or for removing the cutter c entirely from contact with boltb. Plate s is aformerorroller-guide, upon the upper edge, s', of whichroller r travels. Surface sis shaped so as to conform to the requiredsize, taper, and general shape of the screw to be cut, the roller Ir intraveling over surface s causing cutter to tilt to or from bolt b, inconformity with the lines and undnlations of said surface s', withoutinterruption of the rotary or forward movelnentvof cutter c.

To permit cutter c, it having completed its cut, to tilt far enough awayfrom bolt l to return to its original position without coming in contactwith the thread just formed, I provide means for dropping former orroller-guide s s slightly as soon as the thread is finished, so thatrollcri1 may travel back on a lower level. I also provide nieans forraising said guide to its original level as soon as cutter c is returnedfor a new bolt. Plate t, (see Figs. 6, 7, and 8,) which by means ofset-screws L is adjustable longitudinally, is stationary. On a seat onplate t slides plate u, having standards a', supporting adjustablehorizontal rods u2. Projections u on the upper edge of plate a coincidewith and support similar projections, o, on the lower edge of plate v,to which former or roller guidcplate .s' is attached. Plate c isprovided with an arm, w, extending downward, which dovetails and slidesvertically in slide w in plate t. It will be observed thatplateuonlymoveshorizontally,whileplate o only moves vertically, bothbeing attached to plate t, which can be set to correspond with the cutto be made on any length of bolt b. The rotary cutter having advancedalong bolt b as far as desired, roller r comes in contact with forwardrod, a?, which is previously set at the proper point, causing plate u,with vits projections u, to slide forward, removing the supports fromunder projections c', which drop into recesses at, causing plates @and sto drop,

and causing roller r, and consequently cutter c, to tilt away from boltb, preparatory to the return ofthe cutter to its original position.

When the screw has been threaded as far as required, and the cutter hastilted away from bolt b, a slip-collar and stop, provided with set-screwand adj ustahle on rod w, (said stop having been previously set theproper distance in advance of head 2,) comes in contact with the upperend of catch y, forcing it off lug m on nut m, releasing the nut, sothat it is raised from contact with serewZ bythe downward pull of springnf on lever m. Sliding head t', being now released from the feed ofscrew Z, is, with all its attachments, caused to travel quickly back toits original position by means of a weight or spring. (Not shown in thedrawings.) Roller r on its return comes in contact with rear rod, u2,causing plate u to slide backward, lifting plate c and its former orroller-guide s, together with cutter c, to their original position bymeans of the beveled or wedge-shaped sides of projections a and c'touching and sliding upon each other. A fresh bolt having been supplied,the workman forces downward the handle of lever m, throwing nut m intogear with fecd-screw l. Catch y now slips over` lug in', being forcedforward and held in position by upward pressure of spring y until againtripped by contact with stop :0.

Means for dispensing with any motion of my cutter, save the rotarymotion, will suggest themselves to skilled machinists, it being quitepracticable to cause bolt b to advance and recede longitudinally andlaterally while the thread is forming; but such mechanism would,

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IIS

357,180 J l i 3 n obviously be merely the mechanical equivaf lents ofthe herein-described methods of obtaining the several necessarypositions of cutter and bolt relatively to each other, and I do not,therefore, limit my invention tothe means herein indicated of obtainingthe 'rates of speed and positions of bolt b and cutter c relatively toeach other necessary in threading screws with my'rotary toothed cutter.v

Having fully described the construction and manner of operatingmymachine, what I claim as my invention, and desire to secure by LettersPatent, is

l. In a screw-cutting machine, rotary cutter c, in combination withmeans for causing said cutter to rotate on its axis at a suitable rateof speed relatively to the rate of speed ofthe bolt to be threaded,substantially as shown and described, for the purposes specified.

2. In a screw-cutting machine, rotaryy cutter c, in combination withmeans for causing` said i cutter to recede from the axial line of boltb,

substantially as shown and described, for the purposes set forth.

3. In a screw-cutting machine, cutter @,combined with means for causingsaid cutter to rotate on its axis and to advance along the bolt to bethreaded, substantially as shown and described, for the purposes setforth.

4. In a screw-cutting machine, cutter c, combined with means for causingthe same to rotate on its axis, to advance along'the bolt to bethreaded, and to recede from said bolt laterally, substantially as-shown and described, for the purposes specified.

5. In a screw-cutting machine, rotary cutter c, in combination withmeans for causing the same to rotate on its axis, to advance along thebolt to be threaded, to recede from said bolt according tothe taperthereof,and to return upon the completion of its cut to its startingpoint, substantially as shown and described, for the purposes specified.

6. In combination with toothedl cutter c, shaft d, worm-wheel e, screwf, and shaft g, substantially as shown and described, for the purposesspecified. Y

7. In a screw-cutting machine, cutter c, in combination with shaft d,Worm-wheel e, screw 5o f, shaft g, head t', and feed-screw Z,substantially as shown and described,for the purposes set forth.

, S. In avscrew-cutting machine, rotary cutter c and its supportingmechanism, in corn.

bination with guide or former s s', substantially as shownand described,for the purposes stated. e Y

9. In a screw-cutting machine, in combination with rotary cutter c, itssupporting mechanism, and guide or former s s', a means for causing thelatter to drop at the completion of the thread and toresume its originallevel upon the return of cutter c toits startingpoint, substantially asshown anddescribed, for the purposes set forth.

10. In a screweutting machine, rotary cutter c; head t', and feed-screwZ, in combination with former or guide s s', substantially as shown anddescribed,` for the purposes specied.

11. In a screw-cutting machine, cutter aand its supporting mechanism,-in combination with former or guide s s', having projection o and arm w,plate u, having standards u', rods u, projections a3, and recesses u,and adjustable plate t, having slide w', substantially -as shown anddescribed, for the` purposes set` forth. Y

v 12. In ascrew-cutting machine, rotary cutter c and its supportingmechanism, in combination with feed-screw Z, head t', nut m. lug m',spring m2, lever m3, stop x, and catch i, substantially as shown anddescribed, for the purposes specified.

' 13. In a screw-cutting machine,rotary cutter c and its supportingmechanism, head t',

screw Z, nut m, lug m', spring m2, lever m3, stop' x, and catch y, incombination with suitable means for causing cutter c to return uponcornpletion of thread to its starting-point, substantially as shown anddescribed, for the purposes set forth.

14. In a screwcutting machine, rotary cutter o, in combination withshaft Z,Worm-whee1 e, screw f, shaft g, collar n, sleeve n, plate o,having sockets p, and head t. substantially as shown and described, forthe purposes set forth.

15. In a screw-,cutting machine, rotary cutter c, in combination withpulley A, shaft g and its train of gearing, screwf, wornrwheel e, andshaft eZ, substantially as shown and described, for the purposesspecified.

16. Inra screw-cutting machine, rotary cutter c, in combination withpulley A,screwZ ioo and itstrain of gearing, nut m, head i, shaft HENRYE. COY.

Witnesses:

H. E. KING, W. F. CULBERsoN.

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